JP6725676B2 - Method for ordering an ophthalmic lens and corresponding system - Google Patents

Description

The present invention relates to the field of correction of refractive errors in humans with ophthalmic lenses.

More particularly, the invention relates to a method and corresponding system for ordering ophthalmic lenses.

When ordering an ophthalmic lens, the optician generally defines the desired lens power as prescribed by an ophthalmologist or optometrist.

In the case of a lens having a specific shape or mounted on a specific frame, the spectacle technician also gives a parameter indicating the position of the lens in front of the wearer's eyes. This allows the lens manufacturer to design a lens that will be placed in front of the eye in a particular manner but will produce the desired correction.

However, this has the result that the lens power measured by the optician on the lens meter (when checking the lens received from the manufacturer) is generally different from the prescribed power.

For this reason, when supplying lenses, manufacturers often provide the prescribed power (specified in the purchase order) as well as the expected power to be measured on the lens meter. Yes, but this can often lead to confusion.

In this context, the invention provides a method of ordering an ophthalmic lens, the method comprising:
Obtaining data representative of the desired correction of the wearer's eyes;
-By using the electronic device, it will be measured on the lens meter based on the acquired data and at least one parameter defining the expected position of the lens in relation to the eye of the wearer. Determining the lens power,
Ordering an ophthalmic lens that defines the determined power, and
Have.

Therefore, the refractive power value used as a reference by the ordering party and the lens supplier is also the number of times that the ordering party will be measured on the lens meter when validating the received lens, and as a result of any confusion. Risks are avoided.

According to the possible (and thus non-limiting) features:
The determined lens power is measured on the lens meter of a lens adapted to provide the desired correction to the wearer's eye when placed in the expected position in relation to the wearer's eye. It corresponds to the frequency
-The above parameters represent the distance between the lens and the eye of the wearer,
-The above parameters represent the orientation of the lens in relation to the eye of the wearer,
The step of determining the lens power to be measured is also based on the characteristic of the lens, which characteristic is e.g. the shape of at least a part of the lens or the refractive index of the material forming the lens. Represents,
Determining the lens power to be measured comprises using a ray tracing method,
The step of determining the lens power to be measured comprises the step of reading in the look-up table the lens power to be measured,
The data representing the desired correction of the wearer's eye has a power value determined during the subjective refraction test,
The data representing the desired correction of the wearer's eyes has data representing the position of the wearer's head in relation to the refraction device in determining the desired correction by a refraction device,
-The method further comprises designing the ophthalmic lens such that the designed ophthalmic lens provides a determined power as measured by a lens meter,
The method further comprises the step of selecting an ophthalmic lens having a measured power on the lens meter, which is close to the determined power.

The present invention also provides a system for ordering ophthalmic lenses (eg, located in an optician's store), the system comprising:
An input module for obtaining data representative of the desired correction of the wearer's eyes,
-Designed to determine the lens power to be measured on the lens meter based on the acquired data and at least one parameter defining the expected position of the lens in relation to the eye of the wearer. Electronic device,
A communication module for electronically ordering an ophthalmic lens that defines the determined power,
Have.

The input module may be a user interface, in which case the data representative of the desired correction of the wearer's eyes may be provided by a user of the system (eg an optician) or from a database, eg a remote database. It may be entered by a (software) tool adapted to obtain the data.

The accompanying drawings are as follows:

FIG. 1 shows an exemplary system in which the present invention may be implemented. FIG. 2 shows a method of providing a lens to a person, including the steps according to the invention. FIG. 3 shows the positioning of the human eye in relation to the lens of the refractor when performing subjective refraction. FIG. 4 shows a frame selected by a person, positioned on the person's head.

The system shown in FIG. 1 includes an ophthalmologist specialist computer system S _ECP , an eyeglass dealer computer system S _OPT , a manufacturing lab computer system S _LAB, and a database computer system S _DB .

These computer systems _{S ECP,} S _OPT, each S _{LAB, S DB,} includes a processor (e.g., microprocessor), a storage device (such as a semiconductor memory or a hard disk drive), a. Each computer system _{S ECP, S OPT, S LAB} , in _{S DB,} computer system storage devices, when executed by a processor, the computer system _S ECP _involved, S _OPT, S _LAB, is _{S DB,} related Computer program instructions executable by a processor, such as those described below for executing the method.

These computer systems _{S ECP,} S _OPT, each S _{LAB, S DB,} the computer system _S ECP _involved, S _OPT, S _LAB, possible to connect the _{S DB} to the communication network I such as the Internet It also includes a communication module that enables data to be exchanged with any of the computer systems S _ECP , S _OPT , S _LAB , S _DB via this communication network I. Computer system _{S ECP,} S _OPT, data exchange between the S _{LAB, S DB,} in order to guarantee the confidentiality of the data exchanged, may be encrypted by known means.

The ophthalmologist specialist computer system _SECP is located, for example, in the facility of an optometrist or an ophthalmologist. According to a possible alternative embodiment described below, the ophthalmologist may not have his own computer system and the prescription data provided by such an ophthalmologist may be a paper prescription. May be transmitted to the eyeglass dealer.

In FIG. 1, the database computer system S _DB is represented as a remote server that is separate from, for example, the eyeglass dealer computer system S _OPT, and is also separate from the manufacturing lab computer system S _LAB . However, in a possible embodiment, the database computer system S _DB may be implemented together with the eyeglass dealer computer system S _OPT or the manufacturing lab computer system S _LAB , ie stored in the database computer system S _DB described below. The data to be stored may be stored in the optician computer system S _OPT or in the database computer system S _DB .

FIG. 2 illustrates a method of providing a lens to a person to compensate for the refractive error of the person.

The method begins when an ophthalmologist, such as an ophthalmologist or optometrist, performs in step S2 a test of a person's eye, referred to as "subjective refraction." Also, instead of the subjective refraction test, objective refraction using an autoreflector or an aberrometer may be used.

In this test, the person's eyes are placed in front of the eyepiece of the refractor and the person is observing through the refractor.

The ophthalmologist can then modify the power of the refractive device to find the power that provides the best correction for the person.

Therefore, according to this test, for each eye of the person, it is provided to the person, defined by the prescription data, spherical power S and/or cylindrical power C and/or cylinder axis A. The refractive power can be determined. These refractive power values are commonly referred to as "refraction values" and correspond to the desired correction of refractive error in a person.

The subjective refraction test can be performed for multiple types of visual acuity (eg, farsightedness and nearsightedness), each of which corresponds to multiple gaze directions.

Therefore, the prescription data obtained by the subjective refraction test includes the spherical refractive power S _e,t , the cylindrical refractive power C _e,t , and the cylindrical axis A for each eye e and each visual acuity type t. _e,t may be included.

In fact, prescription data for a type of visual acuity that is distinct from distance vision (eg, nearsightedness) is generally presented by comparison with farsighted prescription data, and for eye e the prescription data is Spherical power S _e,d and cylindrical power vector for distance vision
(Is the cylindrical power vector
Defines the cylindrical power C _e,d and the cylindrical axis A _e,d ) and the equivalent spherical power addition EA _e for other types of visual acuity (eg near vision) and the cylindrical refraction. Is a force vector
, For other types of vision, vector variation
And, including.

Here, as described further below, it is proposed to consider the position of the person's head in relation to the refraction device (for each eye and for each gaze direction) during the subjective refraction test. To be done. That is, during the subjective refraction test, the parameter representing the position of the head of the individual in relation to the refraction device is measured and recorded.

Therefore, according to one possible embodiment, the distance D ₁ (see FIG. 3) between the cornea of the eye E under test and the optically effective part P (eg lens) of the refractive device is determined. Can be judged and recorded.

In practice, such a determination measures, for example, the distance between the cornea and the eyepiece (eg, by using an image capture device attached to the refractive device), and This is done by adding the known distances between the optically effective parts.

According to another possible embodiment, the distance D ₂ between the center of rotation O of the eye E under test and the optically effective part P of the refracting device and/or the head of the person in relation to the refracting device. Other parameters that define the position of the person's head in relation to the refraction device, such as the yaw angle and/or the roll angle of the person's head in relation to the refraction device, may be considered.

In one possible embodiment, the position of the person's head in relation to the refracting device is determined by three coordinates defining the location of the person's head in relation to the refracting device and the position of the person in relation to the refracting device. It can be defined by three angles that define the orientation of the head.

The parameter defining the position of the person's head in relation to the refraction device is, for example, the posture analysis device described in the French patent application published as French patent application No. 3021443. It can be obtained by using it.

It may also be possible to use the mean eye center of rotation position, especially for the distance from the center of rotation of the left and right eye to the refractive device. By using the mean eye center of rotation position for both eyes, complexity is reduced without degrading the accuracy of most power values.

It is also possible to measure and record the distance between the center of rotation of the left eye and the center of rotation of the right eye.

To define the position of the person's head in relation to the refractor (eg, by the three coordinates and three angles described above), linked to the person's head and defined as A dimensional reference frame R can be used.
- an intermediate point between the origin O _REF center rotation of the left eye O _L and the rotation center O _R of the right eye,
-Its first axis X passes through both centers of rotation O _L , O _R ,
The second axis Y is located in the sagittal plane,
The third axis Z corresponds to the main gaze direction.

The respective positions of the centers of rotation O _L , O _R of the eye can be determined, for example, by using the method described in the French patent application published as FR 2914173. Can be judged.

Thus, by using a metrology device which has a fixed position in relation to the refracting device and which is adapted to determine the individual position of the center of rotation and thus the position of the reference frame R, It is possible to determine the position of the refracting device (eg represented by three coordinates and three angles) within the reference frame R, ie to define the position of the person's head in relation to the refracting device. You can get the parameters.

According to one possible embodiment, the actual gaze direction of each eye in the subjective refraction test should be measured and recorded for each visual acuity type (eg, far vision, intermediate vision, and near vision). You can

Then, the various data acquired in the above-mentioned subjective refraction (ie, specifically, for each eye and for each gaze direction considered, the refractive power to be provided to the person definition data as well as data defining the position of the head of the person in relation to the refracting apparatus) may be input to the eye care professional computer system S _ECP, and is sent to the database computer system S _DB The data may be stored within the system, for example in the context of an identifier of the person concerned (possibly in the form of a matrix barcode).

However, as already explained, in a possible embodiment, these data may be filled in by an ophthalmologist on a paper prescription that will later be given by the person to the optician.

The method of FIG. 2 continues at step S4, where the person is selecting a frame in an optician store. This frame is intended to carry a pair of ophthalmic lenses, each lens being designed to provide the above-described refractive power to a person, as described below.

When worn by a person, as shown in FIG. 4, the frame F has a predetermined position in relation to the person's head H, which position corresponds to one of the person's eyes E. It can be defined by several parameters such as the distance between the corresponding lenses L carried by the frame F, the front form angle and the tilt angle T.

The distance considered between the eye E and the lens L may be, for example, the distance D′ ₂ between the rotation center O of the eye E and the lens L, or, as a variant, between the cornea and the lens L. May be D′ ₁ .

The front angle is the angle between the average vertical plane of the rim of the frame and the vertical plane that is perpendicular to the sagittal plane of the person's head.

The tilt angle T is the angle between the plane RP containing the rim and the vertical plane VP (eg containing the corresponding center of rotation O of the eye).

The values of such parameters of the frame selected by the person are measured in step S4, for example by using the measuring device described in the international application published as WO 2008/129168. be able to.

Then, measured values (by being inputted on spectacle quotient computer system S _OPT, or automatically by being transferred to the system by the measurement device) The eyeglass quotient computer system S in _OPT It can be saved and possibly sent to a database computer system S _DB for remote storage in connection with a person's identifier.

Also, in the embodiment where the data obtained in the subjective refraction step S2 is communicated to the optician using a paper prescription, these data may be input at this stage using an input module (such as a user interface). It may be input to the optician computer system S _OPT and possibly sent to the database computer system S _DB for remote storage.

According to one possible variant, for example, by simulating the positioning of the frame on the person's head and/or based on a predefined value associated with the selected frame, Parameters related to the position of the frame in the relationship can be evaluated.

Then, in step S6, the optician selects a lens type (eg, from a list of possible lens types) and obtains the refractive power needed to compensate for the refractive error of the person. In order to do so, a first tool (here running on an optician computer system S _OPT ) designed to determine (eg, calculate) parameters characterizing each of the ophthalmic lenses to be mounted in the selected frame. Software tool that is running). In some embodiments (where these parameters are not used when ordering the lens), this first tool can be implemented in step S12 described below.

The type of lens (e.g. spherical, bifocal, progressive multifocal) is selected by the optician depending on the prescription and on the taste of the person.

Precisely, for each eye of the person, the first tool is designed to calculate the parameters characterizing these lenses based on:
-The power value (possibly in multiple gaze directions) obtained in the subjective refraction test-representing the relative position of the refractor in relation to the center of rotation of the eye in the subjective refraction test (probably the gaze being tested Parameter-having a specific value for each of the directions-a parameter representing the position of the frame in relation to the person's head, and
-Characteristics of the selected lens type (such as material and/or thickness and/or lens shape and/or optical design of the lens, such as curvature of the front or back surface of the lens).

The refractive power value can be obtained, for example, from the database computer system S _DB (eg, based on the person identifier described above).

Further, in the measurement of the position of the head of the person in relation to the refracting device performed in step S2, (the above-mentioned between the rotation center O of the eye E to be tested and the optically effective portion P of the refracting device When the position of the eye rotation center O (such as the distance D2) is taken into account, a parameter representing the relative position of the refracting device in relation to the eye rotation center O in the subjective refraction test is obtained from the database computer system SDB. You can also

However, in the measurement of the position of the person's head in relation to the refraction device performed in step S2 (and obtainable from the database computer system SDB) (for example, here, here, the cornea of the eye E to be tested). (When measuring the distance D1 between the optically effective portion P of the refracting device) and the position of the eye rotation center O is not taken into consideration, the eye rotation center O (for example, three-dimensional ) The position measurement is used as a reference to define this eye rotation center O in relation to the person's head (specifically in step S2 to define the position of the person's head in relation to the refractor). (In relation to a part of the head, here the cornea), and thus during subjective refraction in the same three-dimensional reference frame, for example reference frame R described above. In order to be able to obtain the position of the center of rotation O of the eye and the position of the refracting device, step S4 is carried out by the eyeglass dealer.

The first tool is that for each gaze direction considered, the refractive power provided by the lens when mounted in the frame (possibly positioned on the person's head) is measured by the subjective refraction test. Is designed to determine the parameters that characterize the lens in a manner that is identical to that provided by the refracting device (which is determined from the refraction value represented by the first data). And the parameter represents the relative position of the refracting device in relation to the center of rotation O of the eye in the subjective refraction test).

The refractive power provided by the refracting device can be determined from the first data representing the refraction value and from the relative position of the refracting device in relation to the center of rotation of the eye in the following manner.

When the equivalent spherical power (refraction value) represented by the first data is expressed as Sa, the equivalent spherical power Sam of the refractive power provided by the refracting device can be determined as follows. ..
1/Sam=1/Sa−D ₂ (1)

When the equivalent spherical power of the refractive power provided by the lens is expressed as SI, the equivalent spherical power of the refractive power provided by the lens considering the parameter representing the position of the frame in relation to the human head. SIm can be determined as follows.

If the distance D ₂ ′ is not determined, a standard value can be used instead, eg D ₂ ′=27 mm.

Cylindrical power can be treated in a similar fashion by applying the above equation to the minimum and maximum powers.

Therefore, as described above, the lens is SIm=Sam in the case of a spherical lens, or by using equations (1) and (2) when the lens has a cylinder, The minimum and maximum powers are designed to be equal for the optical power provided by the lens and the optical power provided by the refractive device.

It should be noted that the determination of the optical power provided by the refracting device may be performed in a previous step, eg step S2 above. In this case, the optometrist or ophthalmologist who performed the refraction in step S2 may send this refraction power to the optician, and in this case, the refraction device in relation to the center of rotation of the eye. It is not necessary to send the relative position to the optician.

This last example corresponds to the case where the first data mentioned above represents the power provided by the refracting device at the position of the eyepiece.

Further, the refracting power can include high-order optical aberrations (such as coma and trilobal pattern) when the refracting device is, for example, an aberrometer. In this case, it is proposed to calculate the propagation of the initial optical wavefront from the eyepiece of the aberrometer to the position of the center of rotation of the eye, for example by using ray tracing. This applies in particular when the wavefront measured by the aberrometer is determined at the position of the eyepiece. The initial wavefront may be the sum of Zernike polynomials, and consequently the propagated wavefront is also the sum of Zernike polynomials having different coefficients than the initial wavefront.

In addition to this, when performing the subjective refraction test, the actual distance of the target used can also be taken into account in the equivalent spherical power of the power. For example, when the distance vision distance used is DtargetFV, the equivalent spherical power S'of distance vision can be changed by the system of S″=S′−1/DtargetFV. If the equivalent spherical surface EAe′ is determined at a near vision distance DtargetNV different from the reference near vision distance DtargetNVref, the change is EAe″=EAe′−(1/DtargetNV−1/DtargetNVref). May be

The parameters characterizing the lens may actually be calculated by using methods such as the ray tracing method or those described in the international application published under WO 2007/017766. it can.

This above-described operation may be performed by the spectacles computer system S _OPT (where the software tool is running) or by a (dedicated) remote computer system (connected to the spectacles computer system S _OPT ). It may be performed (fully or partially).

According to one possible variant, the parameters characterizing the lens are: for the (many) possible values of the refractive power obtained during the subjective refraction test, of the person's head in relation to the refracting device in the subjective refraction test. It has been pre-computed for possible values of the position parameter, for possible values of the frame position parameter in relation to the person's head, and for possible characteristics of possible types of lenses. The pre-computed values are stored in the look-up table in the spectacle quotient computer system S _OPT or in the database computer system S _DB .

In such an embodiment, step S6 includes reading the parameters characterizing the lens stored in a look-up table described in connection with:
The refractive power value obtained during the subjective refraction test (step S2),
A parameter representing the relative position of the refracting device in relation to the center of rotation O of the eye in the subjective refraction test (step S2),
A parameter representing the position of the frame in relation to the head of the person (measured in step S4), and
The characteristics of the type of lens selected in step S6

The spectacles dealer is then designed in step S8 to determine the power of the lens defined by the parameters determined in step S6, which will be measured on the lens meter (or focal length meter). A second tool (here, a software tool executed by the optician computer system S _OPT ) can be activated (this determination is carried out for both lenses to be mounted on the selected frame). ..

These parameters are, for example, the distance between the lens and the eye of the wearer and/or the orientation of the lens in relation to the eye of the wearer (all of which determine the position of the frame in relation to the head of the person. (Derived from the parameters that are represented), the refractive power of the lens, the shape and/or shape of at least a portion of the lens, the refractive index of the material forming the lens, the optical design, and the like.

Determining the power to be measured on the lens meter is, for example, actually a small incident on the front surface of the lens (the rear surface of the lens is perpendicular to the ray at the point where it intersects the ray). Degrees that will be simulated based on a bundle of parallel rays of diameter (eg, 4 mm), the focus will be determined based on the wavefront of the rays on the back surface, and the distance will be measured based on the distance between the back surface and the determined focus Can be executed by determining. Specifically, this simulation can be performed by using the determined parameters that characterize the lens, if available from the first tool described above.

According to a possible variant, the power to be measured on the lens meter is a look that stores the default power values each associated with a given set of values of the parameters determined in step S6. It can be determined by reading the relevant record in the up table. Each power value in the look-up table is calculated by simulating the effect of the lens defined by the set of related parameters, or by designing the power of the designed lens defined by the set of related parameters. It can be acquired in advance by measuring on the lens meter.

The determined frequency (in diopters) may be rounded to the nearest quarter diopter (eg, 1.3D is rounded to 1.25D), or 1/8 diopters. May be rounded (eg 1.15D rounded to 1.125D).

Next, the eyeglass dealer orders the ophthalmic lens in step S10 by defining the power determined in step S8 (the power to be measured on the lens meter) for each ophthalmic lens.

The ophthalmic lens is electronically ordered, for example, by sending an electronic purchase order from the eyeglass dealer computer system S _OPT to the manufacturing lab computer system S _LAB .

The purchase order may also include complementary data, such as the type of lens selected in step S6 and/or one or more parameters that characterize the lens determined in step S6. These complementary data can include parameters representing the position of the frame in relation to the person's head determined in step S4, especially when the lens is progressively multifocal.

Next, the ordered lens is prepared by the manufacturing lab in step S12.

In some embodiments, this is a prefabricated lens (especially when this power is rounded to the nearest quarter or eighth diopters as previously proposed). In stock, the lens has a refractive power (measured on the lens meter) equal to the power specified in the purchase order, or the lens whose power is closest to the power specified in the purchase order It just means to collect,.

In other embodiments (e.g., progressive multifocal), this involves designing a lens that matches the constraints defined in the purchase order and manufacturing the designed lens.

For example, in the case of a progressive multifocal lens, the purchase order may include the above-mentioned refractive power to be measured on the lens meter and the lens meter (defining the lens in the gaze direction corresponding to near vision). And the addition to be measured.

Therefore, the rear surface of the lens (and/or the front surface of the lens) has the result that the optical power (measured on the lens meter) provided by this surface in the first region corresponding to distance vision results in a purchase order. The refractive power (measured on the lens meter) provided by this surface in the second region corresponding to near vision and equal to the refractive power described in Can be designed (e.g., by simulation using ray tracing) to be equal to the optical power defined by the addition.

The prepared lens is packaged and sent to an eyeglass dealer.

When the purchase order specifies the refractive power that will be measured on the lens meter, the packaging carrying the lens will only contain the refractive power that will be measured for this lens on the lens meter. It is suggested to notify.

In step S14, the eyeglass dealer receives the lenses together with the notification of the refractive power to be measured on the lens meter for each lens.

Therefore, an eyeglass dealer can place each lens on his or her own lens meter, and the refractive power of the related lens measured by the lens meter is the value reported on the packaging. (And, therefore, the value specified in the purchase order) can be verified.

Since the refractive power values used when ordering and verifying are only the values that will be measured on the lens meter, there is a risk of confusion with another refractive power value that characterizes the lens. Not not.

Also, according to a possible variant, the power value is determined by using further parameters, for example using known optical combinations of lenses used in the refracting device. You can also do it. In fact, the exact power provided by the refracting device can be determined, for example, by using ray tracing calculations.

Ray tracing may use a simulated ray bundle starting from a source located at a location corresponding to the location of the visual stimulus as the refraction is performed, and then the ray bundle is It propagates through the different optical components (such as lenses and mirrors) of the refracting device, which have the optical properties and positions used in doing so, and then to the center of rotation of the eye.

This results in relatively high power values, especially when using trial frames or phoropters where the sum of the powers of the lenses used to produce the refraction is not exactly equal to the power provided by this combination. Measurement accuracy is acceptable.

Claims (13)

A method of ordering an ophthalmic lens (L) ,
Obtaining data representative of the desired correction of the wearer's eye (E);
-By using an electronic device, at least one parameter (D' ₁ , D) defining an expected position of the ophthalmic lens (L) in relation to the acquired data and the eye (E) of the wearer. ' ₂ , T), and the step of determining the lens power to be measured on the lens meter (S6, S8),
Ordering the ophthalmic lens (L) defining the determined lens power (S10),
Have a,
The determined lens power is adapted to provide the desired correction to the wearer's eye (E) when placed in the expected position in relation to the wearer's eye (E). A method corresponding to the lens power of the ophthalmic lens (L) measured on the lens meter . The method according to claim 1 , wherein the parameter represents a distance (D′ ₁ , D′ ₂ ) between the ophthalmic lens (L) and the eye (E) of the wearer. The method of claim 1 , wherein the parameter represents an orientation (T) of the ophthalmic lens (L) in relation to the eye (E) of the wearer. The step of determining lens power that will be measured, the method according to any one of claim 1 to 3 is based on the characteristics of the ophthalmic lens (L). The characteristics of the ophthalmic lens (L) The method of claim 4, which represents at least a portion of the shape of the ophthalmic lens (L). The characteristics of the ophthalmic lens (L) The method of claim 4 is the refractive index of the material forming the ophthalmic lens (L). The step of determining lens power that will be measured, the method according to any one of claim 1 to 6, including the step of using ray tracing method. Wherein determining the measured is thus lens power The method according to any one of claims 1 to 6, comprising the step of reading a lens power that will be the measurement in the lookup table. The method according to any one of claims 1 to 9 , wherein the data representing the desired correction of the eye (E) of the wearer has a power value determined during a subjective refraction test. The data representing the desired correction of the wearer's eye (E) is data (D ₁ , representing the wearer's head position in relation to the refraction device in determining the desired correction by a refraction device). the method according to any one of claims 1 to 8 having a D _2). Designed by the ophthalmic lens (L) is, to provide the determined lens power is measured on the lens meter, according to claim 1-10, further comprising the step of designing the ophthalmic lens (L) The method according to any one of claims. The determined close to the lens power, the method according to any one of claims 1 to 10, further comprising the step of selecting an ophthalmic lens (L) having a lens power which is Oite measured on the lens meter. A system (S _OPT ) for ordering an ophthalmic lens (L) ,
An input module for obtaining data representative of the desired correction of the wearer's eye (E),
-At least one parameter (D' ₁ , D' ₂ , T) defining the expected position of the ophthalmic lens (L) in relation to the acquired data and the eye (E) of the wearer, An electronic device designed to determine the lens power to be measured on the lens meter,
A communication module for electronically ordering the ophthalmic lens (L) defining the determined lens power,
Have a,
The determined lens power is adapted to provide the desired correction to the wearer's eye (E) when placed in the expected position in relation to the wearer's eye (E). A system corresponding to the lens power of the ophthalmic lens (L) measured on the lens meter .